Related Experiment Video
Updated: Jun 25, 2026
08:12
Ohmic Contact Fabrication Using a Focused-ion Beam Technique and Electrical Characterization for Layer Semiconductor Nanostructures
Published on: December 5, 2015
The interface state assisted charge transport at the MoO(3)/metal interface.
Yeonjin Yi1, Pyung Eun Jeon, Hyunbok Lee
1Division of Advanced Technology, Korea Research Institute of Standards and Science, Daejeon, South Korea. yeonjin@kriss.re.kr
The Journal of Chemical Physics
|March 12, 2009
Summary
Molybdenum trioxide (MoO3) significantly boosts organic device performance by increasing metal work functions and creating interface states. This improves carrier injection and charge transport, crucial for efficient organic electronics.
Area of Science:
- Materials Science
- Surface Science
- Organic Electronics
Background:
- Understanding metal-organic interfaces is key for efficient organic electronic devices.
- Molybdenum trioxide (MoO3) is a widely used material for modifying electrode work functions.
Purpose of the Study:
- To investigate the interface formation between MoO3 and metal electrodes (Au and Al).
- To elucidate the mechanisms behind improved carrier injection and charge transport in organic devices using MoO3.
Main Methods:
- In situ ultraviolet and X-ray photoemission spectroscopy.
- Step-by-step deposition of MoO3 on Au and Al substrates.
Main Results:
- MoO3 deposition induces significant interface dipoles, increasing the work functions of Au and Al.
- Interface states near the Fermi level are observed at initial MoO3 deposition stages.
- These effects collectively enhance carrier injection and charge transport.
Conclusions:
- The work function increase due to interface dipoles is the primary factor for improved carrier injection.
- Interface states facilitate charge transport from metal electrodes.
- MoO3 is an effective material for optimizing metal electrodes in organic devices.
Related Concept Videos
01:24Metal-Semiconductor Junctions
The contact of metal and semiconductor can lead to the formation of a junction with either Schottky or Ohmic behavior.
Schottky Barriers
Schottky barriers arise when a metal with a work function (Φm) contacts a semiconductor with a different work function (Φs). Initially, electrons transfer until the Fermi levels of the metal and semiconductor align at equilibrium. For instance, if Φm > Φs, the semiconductor Fermi level is higher than the metal's before contact. The semiconductor's...
Schottky Barriers
Schottky barriers arise when a metal with a work function (Φm) contacts a semiconductor with a different work function (Φs). Initially, electrons transfer until the Fermi levels of the metal and semiconductor align at equilibrium. For instance, if Φm > Φs, the semiconductor Fermi level is higher than the metal's before contact. The semiconductor's...
01:27Biasing of Metal-Semiconductor Junctions
Biasing metal-semiconductor junctions involves applying a voltage across the junction. Specifically, the metal is connected to a voltage source, while the semiconductor is grounded. This technique is essential for controlling the direction and magnitude of current flow in electronic devices, including diodes, transistors, and photovoltaic cells.
In Schottky junctions, where the semiconductor is n-type, applying a positive voltage to the metal relative to the semiconductor reduces its Fermi...
In Schottky junctions, where the semiconductor is n-type, applying a positive voltage to the metal relative to the semiconductor reduces its Fermi...
01:06Interfacial Electrochemical Methods: Overview
Interfacial electrochemical methods focus on the phenomena occurring at the boundary between an electrode and a solution, as opposed to bulk methods that concentrate on the solution's overall properties. These interfacial methods are classified as either static or dynamic based on the presence of a nonzero current in the electrochemical cell and the consistency of analyte concentrations. Static methods, such as potentiometry, measure the cell's potential without any significant current passing...
01:30The Electrical Double Layer
In the region where two bulk phases meet, an intricate electric charge distribution arises due to charge transfer, ion adsorption, molecular orientation, and charge distortion. This complex distribution is commonly referred to as the electrical double layer.When a solid electrode interfaces with ions in an electrolyte solution, the speed of electron transfer dictates the rates of oxidation and reduction. The electrode acquires a charge through the escape of atoms into the solution as cations or...
01:16MOSFET
The Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET) plays a pivotal role in modern electronics thanks to its versatility and efficiency in controlling electrical currents. This device, also known as IGFET, MISFET, and MOSFET, has three main terminals: the Source, Drain, and Gate. MOSFETs are classified into n-channel or p-channel types based on the doping characteristics of their substrate and the source or drain regions.
In an n-MOSFET, the structure includes n-type source and drain...
In an n-MOSFET, the structure includes n-type source and drain...
01:15Charging Conductors By Induction
The Earth is a good conductor of electricity, and it is so big that it can be considered an infinite source or sink of charges. It can easily exchange charges with any matter.
Generally, conductors like metals do not allow any excess charge to be present on them. Any excess charge added to metals easily flows away, for example, when a metal is placed on the Earth. This process is called earthing.
However, conductors can be charged by a process called induction. For example, consider charging a...
Generally, conductors like metals do not allow any excess charge to be present on them. Any excess charge added to metals easily flows away, for example, when a metal is placed on the Earth. This process is called earthing.
However, conductors can be charged by a process called induction. For example, consider charging a...